<!DOCTYPE html>
<html>
<head>
    <meta charset=utf-8>
    <meta name=viewport content="width=device-width,initial-scale=1">
    <title>blog</title>
    <script type="text/javascript" src="main.js"></script>
</head>
<body>
<div style="width: 100%;height: auto;position: absolute;top: 0;left:0;bottom: 0;background-color: darkgray;">
    <a onclick="login()">login</a>
</div>
</body>
</html>